FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person *   Jepperson Thomas C 2. Date of Event Requiring Statement (Month/Day/Year) 03/04/2005 3. Issuer Name and Ticker or Trading Symbol QUESTAR CORP [STR] (Last) (First) (Middle) 180 EAST 100 SOUTH, P.O. BOX 45433 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Executive Officer 5. If Amendment, Date Original Filed(Month/Day/Year) (Street) SALT LAKE CITY, UT 84145-0433 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock and attached Common Stock Purchase Rights 16,668.051 D   Common Stock and attached Common Stock Purchase Rights 6,052.8154 (1) I Employee Investment Plan

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Common Stock and attached Common Stock Purchase Rights	  (2)	  (2)	Common Stock and attached Common Stock Purchase Rights	57,500	$ (3)	D	Â
Phantom Stock Units	  (4)	  (4)	Phantom Stock Units	269.0133	$ (5)	D	Â

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Jepperson Thomas C 180 EAST 100 SOUTH, P.O. BOX 45433 SALT LAKE CITY, UT 84145-0433	Â	Â	  Executive Officer	Â

Signatures

Abigail L. Jones Attorney in Fact for T. C. Jepperson		03/04/2005
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	As of March 1, 2005, I had 6,052.8154 equivalent shares of stock in my account in the Employee Investment Plan. The number of equivalent shares will fluctuate as Questar's stock price changes, this fluctuation does not reflect any transactions that should be reported.
(2)	I was granted the following options on: 2/13/1996 8,000 2/11/1997 8,000 2/10/1998 8,000 2/9/1999 8,000 2/13/2001 10,000 2/11/2002 12,000 2/11/2003 13,000
(3)	The shares vest in four equal annual installments beginning six months after grant date. Of these shares the following have vested. 8/13/1996 8,000 @16.8125 per share 8/11/1997 8,000 @19.125 per share 8/10/1998 8,000 @21.375 per share 8/9/1999 8,000 @17.00 per share 8/13/2001 10,000 @28.01 per share 8/11/2002 9,000 @22.95 per share 8/11/2003 6,500 @27.11 per share The expiration date of these options is ten years after grant date.
(4)	Phantom stock units will be converted to cash beginning at retirement; my retirement date is unknown.
(5)	I receive phantom stock units as a result of my election to defer compensation pursuant to nonqualified plans.

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